This whole thing was misconstrued. Dan stated that he and Rupert are friends and they've sent all of one text message to each other in 10 years. It's just not what they do. He said that they can sit down and pick up right where they left off and it was just the paparazzi twisting his words like they always do.

“What I said about Rupert and me was that we don’t text each other at the moment. But me and Rupert have probably sent one text to each other in 10 years. We’re really good friends, but we don’t bother with texting. I could sit down next to him tomorrow and it would be like old times. When I’m on these press tours, I go home every night, and sit in bed, and think what did I say that is going to get picked up turned around tomorrow?”
— Daniel Radcliffe on if his words (about his friendship with Rupert Grint) in the Daily Mail were misconstrued. - The Globe and Mail